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[lammps-users] Quenching in a confined volume
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[lammps-users] Quenching in a confined volume

From: Fabian Duarte <Fabian.Duarte@...2160...>
Date: Sat, 26 Aug 2017 16:19:35 +0000

Hi LAMMPS users,

I am currently trying to run a quenching simulation on a cylindrical nanowire. The idea is that I want the cylindrical nanowire to have certain dimensions after the simulation. Similar to what happens in metal casting, where the sample is confined to the volume of a mould and you end up with a desired shape at the end.

When I run a quenching simulation in MD this normally doesn't happen, as the atoms start jiggling around when it reaches the melting point, therefore the shape of the sample ends up being distorted and quite unpredictable.

My approach is as follows but if you could advice of any better way of doing it I would greatly appreciate it.

I was thinking of building a nanowire with the atoms in the surface fixed (by assigning a velocity of 0 to those atoms). I then use fix npt time integration on the rest of the atoms (excluding the surface) to raise the temperature of the sample to 2000K and then quench to 300K.

I have attached the script to have a look.

Many thanks,